I always have so many to do lists on the go. The only thing I really keep with me 24/7 is my cellphone. This tip from Christina at Hanging Around in Primary made my day.
Write a list on your whiteboard at the end of the day of all of the important things you MUST do that night. Then email or text yourself the photo. Now you have your to do list right at your finger tips, and don't have to worry about lost paper.